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Old 11-08-2019, 06:09 AM
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rss IGF - [The physiological role of growth hormone and insulin-like growth factors].

Related Articles [The physiological role of growth hormone and insulin-like growth factors].

Orv Hetil. 2019 Nov;160(45):1774-1783

Authors: Halmos T, Suba I

Abstract
The existence of insulin-like growth factors (IGFs) was recognized in connection with the stimulation of sulfate incorporation into cartilage. IGFs take part in the embryonal development and postnatal growth, in interaction with the growth hormone (GH). The physiological effects of IGF1 are promotion of tissue growth and development, stimulation of cell proliferation, effects on lipid and carbohydrate metabolism, anti-aging, anti-inflammatory, anabolic, anti-oxidant, neuro- and hepatoprotective properties. Our knowledge about the GH/IGF axis is diverse, partly contradictory, their research is continued intensively nowadays. We considered it worthwhile to review and interpret this information. Study on GH/IGF medical reports, with particular reference to the less known metabolic control. 75% of the growth factors are produced in the liver by GH and insulin stimulation; their effects are expressed on specific receptors, and modified by specific binding proteins. IGF1 directly increases the muscle mass, bone density, and the structure of the bones. Intestinal microbiota induces secretion of IGF1, which promotes the development and remodeling of the bones. Short-chain fatty acids, produced in microbial fermented fibers, induce secretion of IGF1, suggesting that microbial activity also affects bone health via IGF1. IGF1 also has a direct and indirect glucose-lowering effect, enhances free fatty acid oxidation in the muscle, reducing the flow of free fatty acid into the liver, improving insulin signaling, resulting in the reduction of hepatic glucose output, and improves insulin sensitivity. IGF1 directly influences the expression of circadian BMAL1 in hypothalamic cells: this refers to the newly recognized 'zeitgeber' role of IGF1. The bioactivity of insulin-like peptides in the brain is characterized by neuronal survival, excitatory and inhibitory neurotransmission, maintenance of normal free fatty acid levels, improvement of cognitive function, protection against cell damage, neurogenesis and angiogenesis. The effects of IGF2 are less outlined, however, it has a relevant role in the development of the fetus, and acts protectively on the brain. Lack or over-expression of IGF1 can be detected or may causally associated in many pathological conditions. According to these collected data, insulin sensitivity may be improved by different pathways. The role of IGFs in these processes should be a task of future research. Orv Hetil. 2019; 160(45): 1774-1783.


PMID: 31680542 [PubMed - indexed for MEDLINE]



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Insulin like growth factors
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